PT-2025-46761 · Linux+3 · Linux Kernel+3

Published 2025-08-18 · Updated 2026-05-07 · CVE-2025-40204

Positive Technologies (AI Summary)

CVSS v2.0

4.6

Medium

Base vector

AV:A/AC:H/Au:N/C:C/I:N/A:N

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel’s SCTP implementation related to Message Authentication Code (MAC) comparison. The MAC comparison was not performed in constant time, potentially allowing for timing attacks. To address this, the MAC comparison was corrected to be constant-time by utilizing an appropriate helper function.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-208

Related Identifiers

AZL-70112

BDU:2025-14663

CVE-2025-40204

DLA-4379-1

DLA-4404-1

OESA-2025-2765

OESA-2025-2766

OESA-2025-2767

OPENSUSE-SU-2025:20172-1

SUSE-SU-2025:4393-1

SUSE-SU-2025:4422-1

SUSE-SU-2025:4505-1

SUSE-SU-2025:4506-1

SUSE-SU-2025:4515-1

SUSE-SU-2025:4516-1

SUSE-SU-2025:4517-1

SUSE-SU-2025:4521-1

SUSE-SU-2025:4530-1

SUSE-SU-2026:0029-1

SUSE-SU-2026:0032-1

SUSE-SU-2026:0033-1

SUSE-SU-2026:0034-1

SUSE-SU-2026:0144-1

SUSE-SU-2026:0145-1

SUSE-SU-2026:0146-1

SUSE-SU-2026:0147-1

SUSE-SU-2026:0148-1

SUSE-SU-2026:0154-1

SUSE-SU-2026:0155-1

SUSE-SU-2026:0163-1

SUSE-SU-2026:0166-1

SUSE-SU-2026:0168-1

SUSE-SU-2026:0169-1

SUSE-SU-2026:0171-1

SUSE-SU-2026:0173-1

SUSE-SU-2026:0174-1

SUSE-SU-2026:0176-1

SUSE-SU-2026:0180-1

SUSE-SU-2026:0184-1

SUSE-SU-2026:0185-1

SUSE-SU-2026:0186-1

SUSE-SU-2026:0187-1

SUSE-SU-2026:0188-1

SUSE-SU-2026:0191-1

SUSE-SU-2026:0200-1

SUSE-SU-2026:0202-1

SUSE-SU-2026:0203-1

SUSE-SU-2026:0204-1

SUSE-SU-2026:0206-1

SUSE-SU-2026:0209-1

SUSE-SU-2026:0246-1

SUSE-SU-2026:0247-1

SUSE-SU-2026:0262-1

SUSE-SU-2026:0269-1

SUSE-SU-2026:0270-1

SUSE-SU-2026:0274-1

SUSE-SU-2026:0283-1

SUSE-SU-2026:0284-1

SUSE-SU-2026:20012-1

SUSE-SU-2026:20015-1

SUSE-SU-2026:20021-1

SUSE-SU-2026:20039-1

SUSE-SU-2026:20059-1

SUSE-SU-2026:20149-1

SUSE-SU-2026:20164-1

SUSE-SU-2026:20168-1

SUSE-SU-2026:20169-1

SUSE-SU-2026:20171-1

SUSE-SU-2026:20202-1

SUSE-SU-2026:20248-1

SUSE-SU-2026:20249-1

SUSE-SU-2026:20250-1

SUSE-SU-2026:20251-1

SUSE-SU-2026:20252-1

SUSE-SU-2026:20253-1

SUSE-SU-2026:20254-1

SUSE-SU-2026:20255-1

SUSE-SU-2026:20256-1

SUSE-SU-2026:20257-1

SUSE-SU-2026:20258-1

SUSE-SU-2026:20259-1

SUSE-SU-2026:20260-1

SUSE-SU-2026:20261-1

SUSE-SU-2026:20262-1

SUSE-SU-2026:20263-1

SUSE-SU-2026:20264-1

SUSE-SU-2026:20265-1

SUSE-SU-2026:20266-1

SUSE-SU-2026:20376-1

SUSE-SU-2026:20377-1

SUSE-SU-2026:20378-1

SUSE-SU-2026:20379-1

SUSE-SU-2026:20380-1

SUSE-SU-2026:20381-1

SUSE-SU-2026:20382-1

SUSE-SU-2026:20383-1

SUSE-SU-2026:20384-1

SUSE-SU-2026:20385-1

SUSE-SU-2026:20392-1

SUSE-SU-2026:20393-1

SUSE-SU-2026:20394-1

SUSE-SU-2026:20395-1

SUSE-SU-2026:20396-1

SUSE-SU-2026:20397-1

SUSE-SU-2026:20398-1

SUSE-SU-2026:20399-1

SUSE-SU-2026:20400-1

SUSE-SU-2026:20473-1

SUSE-SU-2026:20496-1

USN-8029-1

USN-8029-2

USN-8029-3

USN-8030-1

USN-8033-1

USN-8033-2

USN-8033-3

USN-8033-4

USN-8033-5

USN-8033-6

USN-8033-7

USN-8033-8

USN-8034-1

USN-8034-2

USN-8048-1

USN-8095-1

USN-8095-2

USN-8095-3

USN-8095-4

USN-8095-5

USN-8100-1

USN-8125-1

USN-8126-1

USN-8141-1

USN-8163-1

USN-8163-2

USN-8165-1

USN-8243-1

USN-8261-1

Affected Products

Debian

Linuxmint

Linux Kernel

Ubuntu

References · 2335

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40204.json · Exploit
• https://ubuntu.com/security/CVE-2025-38055 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40092 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21833 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39788 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38251 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38543 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8030-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23026 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40284 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4506-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68803 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-40307 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37844 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68264 · Vendor Advisory